Double Rock (Futago-iwa) - Japan Diving

Site Overview

Double Rock (Futago-iwa) is a distinctive twin rock formation off the southern coast of Yonaguni Island featuring two prominent coral-covered pinnacles rising from twenty-two metres to five metres depth. The twin formations create a unique underwater landscape with a swim-through channel between the rocks at twelve metres depth providing exciting exploration opportunities. Both pinnacles are encrusted with healthy coral communities including staghorn thickets table corals and soft corals creating vibrant vertical gardens that shelter hundreds of tropical fish species. The swim-through channel is wide enough for comfortable passage while observing the coral colonisation on both walls. Green sea turtles regularly rest on the shallow ledges while schooling fish create constant movement in the water column between the rocks. The site's accessible depth range and gentle conditions make it one of Yonaguni's most popular sites for all certification levels. The twin formations provide excellent navigation references and the swim-through adds adventure without requiring advanced skills. The clear Yonaguni waters ensure good visibility allowing full appreciation of the unique geological formation and its marine life communities. The proximity to the main harbour ensures short boat rides making it convenient for multi-dive days. The clear Yonaguni waters ensure good visibility allowing full appreciation of the unique geological formation and its marine life communities throughout the dive profile. The proximity to the main harbour ensures short boat rides making it convenient for multi-dive days and an excellent choice for the first or last dive of a Yonaguni diving trip when time is limited.